2.5" NH (NST) Female x 6" NPT Male Adapter Aluminum FM2525 you'll probably get a hose

you'll probably get a hose with a leak or two

Fire & Industrial 3” NH (NST) x 3

single or double layers

The NYFD female thread can fit into NYFD male only

Clear rubber inside liner

2.5" NH (NST) Female x 6" NPT Male Adapter Aluminum FM2525 you'll probably get a hoseSpecifications Female Side 1 2. 5 NH (NST) Female (National Hose National Standard Thread) Male Side 2 6 NPT Male (National Pipe Tapered) Working Pressure 300PSI Max Test Pressure 1000PSI Max Material T 6061 Aluminum (Aircraft Grade) Finishing Anodized (99. 9% Lead Free) NFPA Standards 1963, 4. 12, 5. 1 5. 6. 4 (Corrosion Resistance) Military Standards MIL A 8625 Type III, Class 1 Industrial Standards International ASTM B221 UL Labs Standards 236 8. 1